最佳答案:Knocking into players and falling down would be dangerous.
最佳答案:Function of random number creation.Function of getting the current frame.MethodT
最佳答案:The battery must be placed in the required position in the battery room when the
最佳答案:Both the mutual academic communications and the cultural exchanges can do me a g
最佳答案:既然是翻译来的,那就很好理解了.我估计应改是对弹性碰撞的翻译不准确,这里应该是不完全弹性碰撞,有能量的损失,所以不能用动能守恒做,而用动量可得答案1.动量守恒和